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Population structure and genetic diversity of Mangalarga Marchador horses
Livestock Science ( IF 1.8 ) Pub Date : 2020-05-29 , DOI: 10.1016/j.livsci.2020.104109
Marielle Moura Baena , Izally Carvalho Gervásio , Renata de Fátima Bretanha Rocha , Alessandro Moreira Procópio , Raquel Silva de Moura , Sarah Laguna Conceição Meirelles

Mangalarga Marchador (MM) is the most numerous horse breed in Brazil. The aim of this study was to analyze the genetic structure of the MM horses population of Brazil based on pedigree analysis and identify factors that may affect its genetic variability. Pedigree data from 1906 to 2015 was used and the inbreeding and probability of gene origin parameters were obtained, considering the total population (TP, n = 514,282) and a reference population (RP, n = 172,508) from 2005 to 2015. The generation interval was 10.43 in the TP and 9.48 in the RP. The inbreeding coefficient (F) was 1.02% in the TP and 1.10% in the RP. The effective population size was 1,471 for the TP and 959 for the RP. The effective number of ancestors, founders, and founder genomes were 1,038, 1,062, and 150 in the TP, and 198, 225, and 133 in the RP, respectively. The numbers of founders that exhibit 50% of the current gene pool of the breed represented 7.94% of the total founders of the TP and 19.09% of the RP. The analysis of probability of gene origin alert for a small loss of genetic diversity in the recent population. However, the Mangalarga Marchador population does not exhibit relevant factors that may seriously affect your genetic variability and that would impair the evolution of the breed in Brazil.



中文翻译:

Mangalarga Marchador马的种群结构和遗传多样性

Mangalarga Marchador(MM)是巴西数量最多的马种。这项研究的目的是基于谱系分析来分析巴西MM马种群的遗传结构,并确定可能影响其遗传变异性的因素。考虑到总人口(TP,n  = 514,282)和参考人口(RP,n),使用了1906年至2015年的家谱数据,并获得了近亲繁殖和基因起源参数的概率 = 172,508)(从2005年到2015年)。TP的生成间隔为10.43,RP的生成间隔为9.48。TP的近交系数(F)为1.02%,RP的为1.10%。TP的有效人口规模为1,471,RP的有效人口规模为959。TP中祖先,创建者和创建者基因组的有效数量分别为1,038、1,062和150,而RP中分别为198、225和133。展示该品种当前基因库的50%的创建者数量占TP总创建者的7.94%和RP总展示者的19.09%。对基因起源概率的分析提示了最近人群中遗传多样性的小损失。但是,Mangalarga Marchador种群没有表现出可能会严重影响您的遗传变异且不会损害巴西该品种进化的相关因素。

更新日期:2020-05-29
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